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ec: Add romstage function for checking and rebooting EC

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Now that we are executing VbInit() in coreboot we can end up
in a situation where the recovery reason is consumed during
VbInit (end of romstage) and then the EC is rebooted to RO
during ramstage EC init, thereby losing the recovery reason.

Two possiblities are to remove the EC check+reboot from ramstage
and let it happen in depthcharge.  This however means that the
system has to boot all the way into depthcharge and then reboot
the EC and the system again.

Instead if we do a check in romstage before VbInit() is called
then we can reboot the EC into RO early and avoid booting all
the way to depthcharge first.

This change adds a ramstage version the EC init function and
calls it from the shared romstage code immediately after the
PCH decode windows are setup.

BUG=chrome-os-partner:19928
BRANCH=none
TEST=manual: enter recovery with crossystem recovery_request=193

Change-Id: Ic927c69a95a2114e29c343f0dcc28374266db394
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/57470
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie 2013-06-04 10:03:34 -07:00 • committed by ChromeBot
commit 1ee11133c0
3 changed files with 46 additions and 2 deletions
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8
src/cpu/intel/haswell/romstage.c
View file

@ -38,6 +38,9 @@
#if CONFIG_CHROMEOS
#include <vendorcode/google/chromeos/chromeos.h>
#endif
#if CONFIG_EC_GOOGLE_CHROMEEC
#include <ec/google/chromeec/ec.h>
#endif
#include "haswell.h"
#include "northbridge/intel/haswell/haswell.h"
#include "northbridge/intel/haswell/raminit.h"
@ -216,6 +219,11 @@ void romstage_common(const struct romstage_params *params)
wake_from_s3 = early_pch_init(params->gpio_map, params->rcba_config);
#if CONFIG_EC_GOOGLE_CHROMEEC
/* Ensure the EC is in the right mode for recovery */
google_chromeec_early_init();
#endif
/* Halt if there was a built in self test failure */
report_bist_failure(params->bist);